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=item getenv

Returns the value of the specified enironment variable.
The same information is available through the C<%ENV> array.

=item geteuid

Returns the effective user identifier.  Identical to Perl's builtin C<$E<gt>>
variable, see L<perlvar/$EUID>.

=item getgid

Returns the user's real group identifier.  Similar to Perl's builtin
variable C<$)>, see L<perlvar/$GID>.

=item getgrgid

This is identical to Perl's builtin C<getgrgid()> function for
returning group entries by group identifiers, see
L<perlfunc/getgrgid>.

=item getgrnam

This is identical to Perl's builtin C<getgrnam()> function for
returning group entries by group names, see L<perlfunc/getgrnam>.

=item getgroups

Returns the ids of the user's supplementary groups.  Similar to Perl's
builtin variable C<$)>, see L<perlvar/$GID>.

=item getlogin

This is identical to Perl's builtin C<getlogin()> function for
returning the user name associated with the current session, see
L<perlfunc/getlogin>.

=item getpgrp

This is identical to Perl's builtin C<getpgrp()> function for
returning the prcess group identifier of the current process, see
L<perlfunc/getpgrp>.

=item getpid

Returns the process identifier.  Identical to Perl's builtin
variable C<$$>, see L<perlvar/$PID>.

=item getppid

This is identical to Perl's builtin C<getppid()> function for
returning the process identifier of the parent process of the current
process , see L<perlfunc/getppid>.

=item getpwnam

This is identical to Perl's builtin C<getpwnam()> function for
returning user entries by user names, see L<perlfunc/getpwnam>.

=item getpwuid

This is identical to Perl's builtin C<getpwuid()> function for
returning user entries by user identifiers, see L<perlfunc/getpwuid>.

=item gets

Returns one line from C<STDIN>, similar to E<lt>E<gt>, also known
as the C<readline()> function, see L<perlfunc/readline>.

B<NOTE>: if you have C programs that still use C<gets()>, be very
afraid.  The C<gets()> function is a source of endless grief because
it has no buffer overrun checks.  It should B<never> be used.  The
C<fgets()> function should be preferred instead.

=item getuid

Returns the user's identifier.  Identical to Perl's builtin C<$E<lt>> variable,
see L<perlvar/$UID>.

=item gmtime

This is identical to Perl's builtin C<gmtime()> function for
converting seconds since the epoch to a date in Greenwich Mean Time,
see L<perlfunc/gmtime>.

=item isalnum

This is identical to the C function, except that it can apply to a
single character or to a whole string.  Note that locale settings may
affect what characters are considered C<isalnum>.  Does not work on
Unicode characters code point 256 or higher.  Consider using regular
expressions and the C</[[:alnum:]]/> construct instead, or possibly
the C</\w/> construct.

=item isalpha

This is identical to the C function, except that it can apply to
a single character or to a whole string.  Note that locale settings
may affect what characters are considered C<isalpha>.  Does not work
on Unicode characters code point 256 or higher.  Consider using regular
expressions and the C</[[:alpha:]]/> construct instead.

=item isatty

Returns a boolean indicating whether the specified filehandle is connected
to a tty.  Similar to the C<-t> operator, see L<perlfunc/-X>.

=item iscntrl

This is identical to the C function, except that it can apply to
a single character or to a whole string.  Note that locale settings
may affect what characters are considered C<iscntrl>.  Does not work
on Unicode characters code point 256 or higher.  Consider using regular
expressions and the C</[[:cntrl:]]/> construct instead.

=item isdigit

This is identical to the C function, except that it can apply to
a single character or to a whole string.  Note that locale settings
may affect what characters are considered C<isdigit> (unlikely, but
still possible). Does not work on Unicode characters code point 256
or higher.  Consider using regular expressions and the C</[[:digit:]]/>
construct instead, or the C</\d/> construct.